Tax implication on payment to mother

Amrita gupta (Student CA Final ) (6 Points)

05 March 2021  
I am a female assessee aged 34 years and i wish to give my savings of Rs 3.5 lakhs to my mother who is a senior citizen so that she could earn interest income on it. Neither me nor my mother fall under taxable limit however we file our itr too. Is it necessary to issue gift deed in this matter to avoid tax or i can straightaway transfer amount in my mothers account?